ModuleNotFoundError: No module named 'beakerx'

I can no longer install beakerx in a docker image with pip3. Error message and docker file below. This worked before although there were [issues](https://github.com/twosigma/beakerx/issues/7867) running the SQL kernel reliably. Strangely I tried installing beakerx in a running Docker container and that seems to work fine.

Any suggestions?

https://github.com/radiant-rstats/docker/blob/master/rsm-msba-beakerx/Dockerfile

```
Step 5/9 : RUN pip3 install beakerx==1.4.1 && beakerx install && jupyter labextension install beakerx-jupyterlab
---> Running in 63c8acb08198
Collecting beakerx==1.4.1
Downloading https://files.pythonhosted.org/packages/d7/f3/08a7e89ed556ed98b5b1df753b0d4687598e41f6a534b331b9450cd594e4/beakerx-1.4.1.tar.gz (117.7MB)
Building wheels for collected packages: beakerx
Building wheel for beakerx (setup.py): started
Building wheel for beakerx (setup.py): finished with status 'done'
Created wheel for beakerx: filename=beakerx-1.4.1-py2.py3-none-any.whl size=118254917 sha256=733aa8dc9756f34454c97a665133dde313c59f43149390c718568cac03779f24
Stored in directory: /root/.cache/pip/wheels/ab/33/ed/1cb9c7d0c88c3c84b02f9a3299f24486ab9f0df58e85a9dd91
Successfully built beakerx
Installing collected packages: beakerx
Successfully installed beakerx-1.4.1
Traceback (most recent call last):
File "/usr/bin/beakerx", line 5, in
from beakerx import run
ModuleNotFoundError: No module named 'beakerx'
```